91 lines
2.9 KiB
Go
91 lines
2.9 KiB
Go
package evm
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import (
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"fmt"
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"time"
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"github.com/cosmos/ethermint/x/evm/keeper"
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"github.com/cosmos/ethermint/x/evm/types"
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ethcmn "github.com/ethereum/go-ethereum/common"
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"github.com/cosmos/cosmos-sdk/telemetry"
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sdk "github.com/cosmos/cosmos-sdk/types"
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sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
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)
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// NewHandler returns a handler for Ethermint type messages.
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func NewHandler(k keeper.Keeper) sdk.Handler {
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defer telemetry.MeasureSince(time.Now(), "evm", "state_transition")
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return func(ctx sdk.Context, msg sdk.Msg) (*sdk.Result, error) {
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snapshotStateDB := k.CommitStateDB.Copy()
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// The "recover" code here is used to solve the problem of dirty data
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// in CommitStateDB due to insufficient gas.
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// The following is a detailed description:
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// If the gas is insufficient during the execution of the "handler",
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// panic will be thrown from the function "ConsumeGas" and finally
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// caught by the function "runTx" from Cosmos. The function "runTx"
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// will think that the execution of Msg has failed and the modified
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// data in the Store will not take effect.
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// Stacktrace：runTx->runMsgs->handler->...->gaskv.Store.Set->ConsumeGas
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// The problem is that when the modified data in the Store does not take
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// effect, the data in the modified CommitStateDB is not rolled back,
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// they take effect, and dirty data is generated.
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// Therefore, the code here specifically deals with this situation.
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// See https://github.com/cosmos/ethermint/issues/668 for more information.
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defer func() {
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if r := recover(); r != nil {
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// We first used "k.CommitStateDB = snapshotStateDB" to roll back
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// CommitStateDB, but this can only change the CommitStateDB in the
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// current Keeper object, but the Keeper object will be destroyed
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// soon, it is not a global variable, so the content pointed to by
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// the CommitStateDB pointer can be modified to take effect.
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types.CopyCommitStateDB(snapshotStateDB, k.CommitStateDB)
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panic(r)
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}
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}()
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ctx = ctx.WithEventManager(sdk.NewEventManager())
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switch msg := msg.(type) {
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case *types.MsgEthereumTx:
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// execute state transition
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res, err := k.EthereumTx(sdk.WrapSDKContext(ctx), msg)
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if err != nil {
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return nil, err
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}
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result, err := sdk.WrapServiceResult(ctx, res, err)
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if err != nil {
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return nil, err
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}
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// log state transition result
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var recipientLog string
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if res.ContractAddress != "" {
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recipientLog = fmt.Sprintf("contract address %s", res.ContractAddress)
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} else {
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recipientLog = fmt.Sprintf("recipient address %s", msg.Data.Recipient)
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}
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sender := ethcmn.BytesToAddress(msg.GetFrom().Bytes())
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log := fmt.Sprintf(
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"executed EVM state transition; sender address %s; %s", sender, recipientLog,
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)
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k.Logger(ctx).Info(log)
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result.Log = log
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return result, nil
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default:
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return nil, sdkerrors.Wrapf(sdkerrors.ErrUnknownRequest, "unrecognized %s message type: %T", types.ModuleName, msg)
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}
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}
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}
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